| Issue |
Europhys. Lett.
Volume 40, Number 2, October II 1997
|
|
|---|---|---|
| Page(s) | 153 - 158 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00438-4 | |
| Published online | 01 September 2002 | |
Microscopic dynamics in liquid deuterium: A transition from collective to single-particle regimes
1
Instituto de Estructura de la Materia, Consejo Superior de
Investigaciones Científicas,
Serrano 123, E-28006 Madrid, Spain
2
Département de Recherche Fondamentale sur la Matière Condensée,
SPSMS/MDN, CEA Grenoble, 38054 Grenoble, France
3
Rutherford
Appleton Laboratory, Chilton, Didcot Oxon, OX11 0QX, UK
Received:
16
June
1997
Accepted:
9
September
1997
Well-defined (propagating) collective density fluctuations are
found for liquid deuterium up to large wave vectors at SVP conditions.
Their phase velocities as well as the
wave vector dependence of the excitation linewidths and strengths indicate that
what is experimentally observed is dominated by a continuation to large
wave vectors of hydrodynamic (sound-mode) excitations.
For wave vectors 
, the spectrum
approaches that of a weakly interacting fluid. A transition to a regime
dominated by single-particle (recoil and quantized rotation) motions is found
to occur within 
, depending upon
thermodynamic conditions.
PACS: 62.10.+s – Mechanical properties of liquids / 62.60.+v – Acoustical properties of liquids
© EDP Sciences, 1997
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